handler倒计时

最新推荐文章于 2024-10-12 11:18:04 发布

原创最新推荐文章于 2024-10-12 11:18:04 发布 · 411 阅读

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这个里面使用了handler中的轮询机制

public class MainActivity extends Activity {

   private TextView tv;

   Handler handler = new Handler(){
       public void handleMessage(android.os.Message msg) {
           int mess = (Integer) msg.obj;
           tv.setText("倒数100个数："+mess);
       };
   };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       tv = (TextView) findViewById(R.id.tv);
        new Thread(){
           public void run() {
               for (int i = 100; i >0; i--) {
                   Message me = new Message();
                   me.obj=i;
                   handler.sendMessage(me);
                   try {
                       sleep(1000);
                   } catch (InterruptedException e) {
                       e.printStackTrace();
                   }
               }
           };
        }.start();
    }
}